Exhaust manifold and muffler



' 1,634 000 June 28, 1927. w. F. SMITH EXHAUST MANIFOLD AND MUFFLER Filed Jan.l2. 1925 2 Sheets-Sheet "1 ATTORNEY June 28, 1927. 1,634,000.

w. F. SMITH EXHAUST MANIFOLD AND MUFFLER Filed Ja'n.12. 1925 2 Sheets-Sheet 2 v INVEIVTO Patented June 28,- 1927.

UNITED s'ra'ras WILLIAM F. smrrn, or ronenxnnrsm,

NEW YORK, ASSIGNOR OI ONE-HALF TO .HERMAN A. SCHATZ, OF POUGHKEEPSIE, NEW YORK.

EXHAUST MANIFOLD AND MFUFFLER.

Application filed January In accordance with the present invention the pipe throu h which the exhaust gas passes is cooled y a draft of air. This will revent the exhaust manifold from preheatmg the air which is intended to cool the engine cylinders. Preferably, the draft of air is produced in a passageway associated with the-mufiler and the air and exhaust gases escape together through 'an opening in' the mufiier easing. In this manner the exhaust gases are used in creating the draft by suction. This \draft of air aids incooling the 2 muflier which is mounted on top of the hood enclosingthe gas engine.

While the invention is disclosed as applied to a particular type of engine, it will be obvious to those skilled in the art that it is applicable also to other types.

In the drawings, Fig. 1 is a perspective view of the muflier ;*Fig. 2 is a vertical crosssection of the exhaust manifold and the muffier; Fig. 3 is a bottom view of the manifold 85 and mufiier; and Figs. 4 and 5 are sectional views along lines 44 and 5-5 of Fig. 2.

Referring now .to the drawings, the bottom 4 of a cast iron casing 1 is seated on a hood 5 enclosing the engine proper (not within a correspondingly sloping annular.

o ening 10 formed in the bottom of easing 1.

he pipe 7 is drawn tight into this seat by means of a. bolt 11 projecting through the top of the: casing 1 and an the ipe 7. h h h 7 e ases arising t rou t e ipe enter througfi the annular opem ng the cas extension '14 of i in the hood 5 which registers with apertures 12, 1925. Serial No. 1,904.

ing 1 and flow therethrough in a left-hand direction (Fig. 3) in the upper half (as viewed in this figure) of the casing 1. The gases are forced to flow in this part of the casing by virtue of the fact that the inside of the casing is longitudinally divided into three compartments by means of an inverted sheet metal trough 15 (Fig. 4) extending be- .tween bafiie plates 16 and 17. These bafile plates are cast integrally with casing 1 and project from the rim 4: thereof in opposite directions about two-thirds across the casing 1. The side walls 18 and 19 of the trough 15 are substantially in alignment with the free ends of the bafile plates 16 and 17. The lower ends of these side walls 18 and 19 are bent back, as shown at 20 and 21, and-the trough is held in place by thesebent-back portions being clamped between the hood 5 and the edges'of a longitudinal opening 12 in the bottom of easing 1.

\ The bafile plate 17 deflects the exhaust gases through perforations 22 in the forward part of 'wall 18 into the trough 15. The baflie plate 16, blocking the other end of the trough, deflects the gases through perfora- 'tions 23 provided in the rear part of the side wall 19, whereupon the gases flow out into the lower section of the casing (Fig. 3) and past the gap between the end of the baflie plate 17 and the side of casing 1 through an aperture26 in the end of the casing 1. During the circuitous passage through the casing or mufller the gases expand, whereby the noise of their escape will be considerably reduced. The expansion of the gases is aided by the provision 'of longitudinal ribs ,or fins 30 cast in the top of casing 1 As previously stated, the invention is particularly applicable to air cooled engines in which the cylinders are, in the well-known manner, provided with fins or webs against which air is blown or drawn. Air drawn past a hotexhaust pipe '7 would not materially aidin cooling the cylinders. In order to remedy this, the exhaust pipe 7 is cooled in the following manner: A sloping sheet metal trough or passageway 30 is fastened to the bottom of the hood in any suitable manner. The trough 30' has an inletopening at'31 near the exhaust pipe 7. The end-of the trough 30' is below an opening 32 33 and 34 in the bottom of the casing 1. The apertures 33 and 34 form the inlet openings-of tubes 35 and 36 forming an integral casting with the front end of casing 1. Owing to the draft created by the exhaust gases escaping through the slot" 26, suction will be applied to orifices 37 and 38 in the tubes 35 and 36, causing the flow of air in the direction of the arrows through the trough 30' and thence out to the atmosphere with the exhaust gases. The continuous passage of ir through the trough 30 will cooperate in he cooling of the exhaust manifold and will cause the exhaust gases to rise after they leave the slot 26, thus protecting the operator against noxious fumes.

What I claim is:,

1. In an exhaust manifold for. internal combustion engines, a casing having cooling fins on one side thereof and an air duct on the other side thereof, two bafile' plates projecting from opposite side walls partly across said casing, two longitudinal walls between said bafile plates and substantially parallel with the side walls of the casing, one of said longitudinal walls being provided with apertures only near one and the other only near the other baflle plate, an exhaust gas intake port between one of said baflle plates and the rear wall of said casing, and an exhaust gas exit port in the front wall of said casing.

2. 11 an exhaust manifold for internal combustion engines, a casing one end wall of which is slotted and the bottom of which is provided with four openings, two bafile plates'dividing said casing into three longitudinal intercommunicating sections, one containing a pair of said openings, and the others the thlrd and fourth of said openings, a. trough inserted in said casing through said third openin between said bafiie plates, the side walls 0 said trough dividing said easing into three transverse compartments, one of said side walls having perforations adjacent one and the other having perforations adjacent the other baffle plate, two tubes extendingfrom said pair of openings towards said slotted end, an exhaust pipe seated in said fourth opening, and a passageway leading from a point adjacent said exhaust pipe to said pair of openings.

3. In an exhaust manifold for internal into three transverse compartments, one of 435 I said side walls having perforations adjacent one and the other having perforations adjacent the other baflie plate, two tubes cast in tegral with said casing and extending from said pair of openings towards said slotted end, an exhaust pipe seated in said circular opening, and an enclosed passageway leading from a point adjacent said exhaust pipe to said pair of openings.

4. A mufller for internal combustion engines comprising a casing having therein a plurality of passageways for exhaust gases, said passageways serving to conduct the 'gases in a circuitous (path through the said casing, an intake an a dischargeopening for said gases, a tapered air duct having for one wall a wall of said casing, said air duct having its large end near the said intake opening and its small end near the said discharge opening and a port interconnecting the small end'of said air duct with the interior of said casing at a point adjacent (said exhaust o ening. In testimony whereof, I have signed my name to this specification this 3rd day of 90 J anuai'y, 1925. I

WILLIAM F. SMITH. 

